Pharyngeal widening voice in treatment for puberphonia: a research by Dr M Kumaresan The pharynx is the chamber that runs from the larynx to the nasal and oral cavities. Widening the pharyngeal cavity serves to lower the first formant (F1) and raise the second formant (F2). When F1 is lowered and tuned to the fundamental frequency (\(F_{0}\)) or its harmonics, the voice can achieve a louder, more resonant, and darker tone without increased vocal effort.